>> reporter: jim and john harbaugh are just 15 months apart. but in two weeks, they'll stand 15 feet apart, face-to-face on the biggest stage in sports. the 49ers stunned the atlanta falcons on sunday, to clinch the nfc title. >> into the end zone for a touchdown. >> reporter: big brother's john's baltimore ravens capped off a cinderella season, sealing their destiny by running over the patriots. this game has its own twitter hash tag, #harbaugh. >> we had a few fights and arguments. we'll try to stay out of that business. we'll have the two teams duke it out as much as possible. >> reporter: john and jim grew up with the game. their father, jack, coached some of the top college teams in the country. the two boys with him every step of the way. but the emotion may only be surpassed by the man wearing number 52, ray lewis, who will come february 3rd, will play his last game in the nfl. lewis, clearly moved after the game, talked about coming back from an injury to make this his last season. >> and i knew, as a leader, the things that i gave up.